I initially built a 4kW LED array using 40 100W emitters with 60 degree glass lenses, but the beam was a bit to wide to be practical for use on a vehicle.
After that I built a 1.8kW array using 18 100W emitters with parabolic reflectors. It had much better long distance throw and was way more practical.
Parabolic Reflectors: https://www.stratusleds.com/parabolic-reflector/
100W LED Drivers: https://www.stratusleds.com/100w-led-driver/